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UNITED STATES PATENT OFFICE.

GEO. J. WARDWELL, OF BARNSTON, CANADA.

STONE-DRESSING MACHINE.

Specification of Letters Patent No. 26,802, dated January 10, 1860.

To all whom it may concern:

Be it known that I, GEO. J. VARDWELL, formerly of Andover, Oxfordcounty, State of Maine, but now of Barnston, county of Stanstead,Canada, have invented a new and useful Improvementin Machines forCutting Marble and Stone; and I do hereby declare that the following isa full, clear, and exact description of the construction and operationof the same, reference being had to the annexed drawings, making a partof this specification, in which- Figure l, is a side elevation; Fig. 2,.is a if'ertical view; Fig. 3, is an elevated section of the back sideof the machine; Fig. ft, is an end view of the counter shafts, pulleysand bed frame; Fig. 5, is an end view of the bed frame, with singleshaft and pulley; Fig. 6, is a side view of the arm for working the feedfinger; Fig. T, is a vertical View of the drill or cutter-head andposts, which serve as guides for the cutter head to move up and down on;Fig. 8, is a side view of the lifting cam; Fig. 9, is a side view of thedriving or forcing cam; Fig. 10, is an end section of frame, sill, shoe,and rail or'track; Fig. 11, is an enlarged side view of cutters ordrills; Fig. 12, is a side view of the stay finger and sword, or arm forraising the feed finger.

Similar letters of reference indicate corresponding parts in each of thedrawings.

A, is the frame of the machine, secured to the sills B.

C, C, are rails or track on which the machine moves a part of the topsurface of the rails or track projects over one `side forming a lip, theopposite side from the lip is furnished with a toothed rack.

D, are shoes or plates secured to the underside of the sills, and theirlower surfaces resting on the top surface of the track; the shoes orplates extend over, around and below the lip on the track or railforming a claw or clasp to prevent the machine from falling from thetrack when working on an angle, the clasps projecting over the frontedge of each track or rail so that the machine will hang thereon,however much the front side may be raised above the other.

E, is the main driving shaft of the machine which extends through bothsides of the frame carrying a balance wheel F on the outside, and theother end carrying a driving pulley Gr and loose pulley H, on theoutside of the frame and back side of the machine; the driving shaftalso carries a pinion I, on the inside which is thrown into, and out ofgear with the wheels J and K by means of the lever L and shipper frameW.

O, is the rocker shaft, to which the beam P, is attached.

Q is a shaft situated below and forward of the rocker shaft carrying alifting cam R, and gear wheel S, which receives motion from the gearwheel J, on shaft T, (situated below and back of the rocker shaft,)which shaft also carries a cam U, for forcing down the beam and drill orcutter head W, after being raised by the lifting cam.

V are posts situated near the forward part of the machine and secured tothe sills, these posts are furnished with V shaped guides which extendbelow the sills on the inside, for the drill or cutter head to move upand down on. The cutter head has a vertical groove or slot X to receivethe cutters or drills Y, which are secured in their place by means ofthe plate Z, and bolts a. The cutter head is connected with the beam bymeans of a pin working in a slot, in the end of the beam.

g, is an arm attached to the rocker shaft, which arm gives motion to thefeed finger working on the ratchet wheel L attached to the shaft j,situated back of the driving shaft. The shaft j, also carries the gearwheel K and bevel pinion z', which pinion works into the bevel gear t,attached to the vertical shaft m, carrying a pinion n on its lower end,which works in the toothed rack on the side of the rail or track.

o is a bellows situated in front of the cutter head, for blowing thedust from under the cutters or drills. Motion is communicated to thebellows from the beam P, through the connecting rods e, and d, andwalking beam The counter shafts 71,', 11, j carrying the pulleys vu ands, and bevel gear wheels la Z with frames o, p, are placed inside ofthebed frames m, and r, and are made to swing on centers for the purpose ofleveling the counter shafts and pulleys when the machine is working onan angle to keep the belt in its proper position on the pulleys a, s;otherwise, its own weight would cause it to work to the lower end ofsaid pulleys, making it difficult to be kept thereon. The power is aplied to the counter-shaft hl', by means o i the pulley'w, situatedthereon.

2 Y Y A 26,802

The shafts are kept in position by the bolts m working in the slots ninthe swords 07, as represented in Figs. 4 and 5;'the bed frame and itsattachments are placedat one end of a quarry or surface that is to becut, and the bed frame 1', with its pulley, &c, is placed at the otherend, or at any convenient distance, andf the machine mounted on thetrack is worked between them. t

g is the belt by which the power is communicated from the counter shafta" to the machine. The lowerk half of the belt makes one continuousreach from the lower surface of the pulley u, to the lower surface ofthe large pulley s, leaving the upper sur'- face in a direction parallelwith the lower half until it reaches the small pulley G on the drivingshaft E of the machine around which it makes a return, passing over thepulley p" on the stud g in the shipper frame, leaving the pulley on it-slower surface, and keeping` the parallel course to the top surface ofthe pulley a on the counter shaft z",' the belt arranged as describedallows the machine to be moved forward and b ack on the track withoutloosening or tightening the belt.

The machine is intended to carry a gang of drills or cutters, (see Fig.ll.) The cutters are constructed with a sharp cutting edge, and

. a blunt or stunning surface, the stunning surface being back of thecutting edge, and even in depth with it; and the gangs are composed ofcutters and stunning surfaces arranged alternately. Each cutter andstunning surface is placed a uniform distance lower than the onepreceding it. A

stunning surface without a cutter takes the lead in the gang.

Z) is the stag finger to the ratchet wheel,

Ahung loosely on the rocker shaft O.

it Vis a sword the lower end of which is attached to the stay finger andis connected to and swings with the feed linger lo.

The operation of the machine is as follows, (the belt and driving shaftE are supposed to be movingz) When the lever L, is swung into theposition as represented in red at Z2 (see Fig, 2,) the shipper frame Mand the end of the driving shaft E, with its pulleys and pinion I, swingwith it, throwing the pinion into gear with the wheel J,

giving motion to the cam shafts T and Q. At the same time the feed andstay fingers 7c and b, which rested on the driving shaft are allowed tofall on to the ratchet wheel t. The lifting cam R raises the beam P,with the drill head W, and cutters Y, while the arm g and feed fingerIc, causes the ratchet wheel h, with the shafts j and m, and gearpinions t, i, n, to make a partial revolution, the pinion n working inthe toothed rack on the side of the rail or track C, thereby giving themachine a forward motion.

After the beam withthe drill head and cutters has been raisedto'theirzhighest elevation, they are immediately forced downward by thecam U, acting on the back end of the beam,A causing the gang Y withtheir cutting and stunning surfaces to come in contact with the stone orsubstance tc be out. The motionsv are then repeated until the machinehas traveled thei'required distance.

The machine is stopped by swinging the lever into its central positiona', which throws the pinion I out of gear and allows it with its shaftto hold an intermediate position between the gear wheels J and K. Themachine is gigged back by swinging the lever to c', which raises thestay and feed fingers off of the ratchet wheel, by the shaft E passingunder the projection on the under or lower edge of the stay finger, andat the same time carries the pinion into gear with the wheel K, whosemotion together with theshafts j and m and their gear and pinions t, z',a, are reversed, and the machine will travel back to the place ofstarting. Vhen the lever is swung to its central position the motionstops, after which the gang of cutters can be set lower in the drillvhead and the operation repeated until the required depth is cut.

The feed of the machineA can be varied by hanging the feed linger higheror lower on the arm g, and properly adjusting the pin in the sword it inrelation thereto.

' The number of cutters or drills and stunning Asurfaces is notnecessarily limited to five, as an other may be used to suit thecapacity o the machine; neither is it necessary to form a cutter and astunning surface from a single bar as each of them may be made ofseparate pieces or bars.

The object of the stunning surfaces is to bruise or stun the marble orstone, previons to being cut, which allows it be more readily or easilyremoved by the cutters, as

well as to insure a uniform depth of cut.

They also will allow more power to be applied to the'machine bylessening the liability of breaking or injuring the cutters.

When the machine is worked in a quarry the track and bed frames arebolted or secured to the marble or stone by screwing bolts into holesfilled with wood, or in any other convenient way.

I do not limit the number of projections on the cams to two, as anyother may be used and produce the same result.

What I claim as my invention and desire to secure by Letters Patent, is-

l. The combination of a stunner and cutter together, or in the sameinstrument, the stunner preceding the cutter in its action, both to stunthe material for the cutter, and to gage the depth of its cut,substantially as described.

2. I also claim the arrangement ofthe pulleys G, and p, shaft E, pinionI, feed l finger la, stay linger b, and sword 71,, Whereby the shippingframe and feed and stay fingers are operated by one and the samemovement of the shipping lever, substan tially in the manner and for thepurposes 15 herein specified.

GEO. J. VVARDWELL. i lvtnesses:

JOHN BUCKLAND, Oris SHURTLEFF.

